The books in this series are very linear, as almost every decision involves solving a puzzle and failing (usually fatally) if you choose wrongly. Quite fun if you don't mind that kind of thing, though, and there are some inventively nasty ways of dying (or worse) in a few of the books.
OK,read this through. Extremley linear, You either die, get the puzzle wrong or head the right way.
I reckon the original owner of the book didn't like the puzzles (mazes, and joining points of shapesetc) very much as the pages are pristine! The author had watched the dr who story 'The Web Planet' as there is a giant moth, and the rest of his species fled to a nearby moon.
The story itself is VERY childish and bland (Monsters are called 'monsters' and have no descriptions otherwise)
Even trying out the puzzles, this wouldn't occupy more than one hour of a childs time...
I have to confess that I loved this series as a kid. I tried one out on my 9 year old son recently and seemed to enjoy it for a few minutes, but didn’t see the book through to its conclusion. But yeah, they’re quite basic.